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Exhausted and distracted parents can sometimes forget they’ve left their kids
in a parked car. To jog their memory, engineers at NASA’s Langley Research
Center in Virginia have developed an alarm that will alert absent-minded parents
if they stray too far. A sensor in the child’s car seat broadcasts a radio
signal to a receiver in a key fob whenever the child is in the seat. If the
receiver can’t pick up the signal, a loud beeper in the fob goes off.